Marcello pirani



Aug. 25, 1925.

M. PIRANI APPARATUS FOR PREPARING ELECTRIC LAMPS Filed Dec. 27, 1922 Fig. I.

InVehbor' Marcello irani, by w 325442 His Attorney.

Patented Aug. 25, 1925.

UNITEDLSTA TES MARCIELI O ERAL ELECTRIC COMPANY, A COBPOBATIQN OI NEW YORK.

1,551,527. PATENT OFFICE.

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APPAMTUS FOR PREPARING ELECTRIC LAMPS. I

Application filed peoember 2'7, serial No. 609,816.

To allwhomitmaycmwem:

Be it known that .I, MARonLm PIRANI,

a citizen of the German Realm, residing at made in which quite a numberpf lamps are carried through each stepat once. Devices of this type are large and are made with the containerand the feeding apparatus inseparable, The apparatus therefore is slow to cool.

In many cases it is desirable to quickly cool lam especially where the lamps are filled wit a gas and it is an object of my invention to therefore reduce to a minimum the amount of apparatus to be cooled. It'is also an object to separatethe heating apparatus from the container or containers'in which the bulbs are placed. I contemplate also making adevice of the above character in which the container is movable with respect to theheating apparatus and to provide other details "of improvement. for increasing the efiiciencyand serviceability of such equipment;

The means for accomplishing all this is hereinafter more fully described and claimed,

Referring to the accompanying drawing, Fig. 1 is a section through one form of device of my invention; Fig. 2 is a plan view of the same; Fig. 3 is an enlargeddrawing of the details within the container about the holder 9 and about the heating device 70.

. Referring more in detail to the drawing, the container a which is of metal or glass, but preferably of the latter, is mounted on the flange b, which latter is removably placed on the disc d. The disc at in tum- I is set on the rotatingcarrier- 0. 'It will be seen that the sleeve 6, which may be of glass, is secured to the disc d. On. the to of the sleeve e, the cup 7' is located, whic cup in turn is secured to a holder 9 upon which the lamp bulb is fastened. It will be observed that the small pump tube 73 of "the bulb it reaches into the fusion or sealing device is, with which the inlet wires Z are connected andwhich wires pass through the flange I). These wires pass throggh the carrier-0 and the passageway is m e airtight.

These wires terminate in the friction con- I tacts m on the under side of the carrier 0.

Within the sleeve 0 there is provided a tube n which opens into the space between it and the container. The latter is connected through the medium of an air-tight connection of the duct 0, which duct is used for both "exhausting and feeding purposes Above the carrier 0 there is arranged a heating box In the construction shown this heatin box is made in a circular form. As in icated in Fig. 2, the circle is not completed in order-that the lamps may be mounted, cooled and removed. The lamps h are placed on the holder 9 over which the container isplaced and made air tight. Therefore the container is exhausted by way of the tube 0-. and this of course also exhausts the bulb h. In this condition the heating box as the carrier 0 advances in its rotation. When the exhaustlon is completed, the current is sent over slip rings m which it is fina y taken off and the feeding lamp removed, whereupon the operation is repeated.

If the lamps are to be filled, with gas, then after the exhaustion and the through the heating box 11, the coo g off container iscaused to travel through the" assage operation first takes place, after which the gas filling opfiration follows, which gas may be argon. e gas reaches the bulb through the tube 72'. and by way of the duct 0. After the gas has been supplied, the small pump tube 6 is sealed off as before by the sealing device 1: wherein the tube 13 is heated.

In order to facilitate the removal of the container after the operation is completed, the duct 0 is finally connected wit-lithe outside air. It will be understood that any suitable air playing device may be used to 'cool off the container after it leaves the heating apparatus.

The object in makin the container preferably of glass is that oth the heating and the cooling operations are hastened; Furthermore, it is advantageous to be able to continuously observe the operations in the container.

In the construction of apparatus which I have shown, the container and interior equipment is preferably given such a shape that the dead space is reduced to a minimum. The object in this is to enable the apparatus to' be 'quickly cooled at the end of the operation. *Upon the rotating car-.

r-ier c I may place a large number of con tainers and with this container, controls for carrying out the various working steps are so connected that when acontainer apv proaches the starting point, it can, be removed and the completed lamp taken out.

What.I claim as new and desire to secure by Letters Patent of the United States,

1s, 1. A device for exhaustingenvelopes for electric glow lamps and the like, said device having a plurality of containers eachhaving a connection for creating "a vacuum within the container, a lamp envelope with in each container, anoven for heating said heating the envelopes while the latter are being exhausted, said device provided with a plurality of containers each container hav- I ing a connection for creating a vacuumin the container, a lamp envelope within each container, an electric heater within each container for sealing off the envelop therein, an oven for heating said containers, said containers being mounted on a carrier, means for moving the carrier whereby the containers may be passed through the oven a. plurality at a time,- and means outside of said containers for heating the oven.

In witness whereof, I have hereunto set my hand this 4th day of December, 1922.

MARcELLo PIRANI. 

